add showf_pt.c

chapter3/showf_pt.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+int main()
+{
+	float aboat = 32000.0;
+	double abet = 2.14e9;
+	long double dip = 5.32e-5;
+
+	printf("%f can be written %e\n", aboat, aboat);
+	// 下一行要求编译器支持c99或者其中的相关特性
+	printf("And it's %a in hexadcimal, powers of 2 notation\n", aboat);
+	printf("%f can be written %e\n", abet, abet);
+	// %LF 可能会存在精度丢失的问题
+	printf("%LF can be written %Le\n", dip, dip);
+
+	return 0;
+}